1.3.54
समस्तृतीयायुक्तात्
Operational rule vidhi
After the verb चर् 'to walk' preceded by सम् , and when connected with a noun in the Instrumental - 3rd Case, the आत्मनेपद is used.
Word by word (padaccheda)
Left context समः pañcamī · ekavacanaLeft context तृतीयायुक्तात् pañcamī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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Full reading
समः तृतीयायुक्तात्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
After the verb चर् 'to walk' preceded by सम् , and when connected with a noun in the Instrumental - 3rd Case, the आत्मनेपद is used.
As अश्वेन संचरते 'he rides on the horse-back.'
The rule does not apply when it is not in composition with a word in the instrumental case. As उभौ लोकौ संचरति इमं चामुं च देवल ! O Devala! thou wanderest through both regions, this and that.' Here though the sense of the Instrumental case is implied, yet as it is not expressly stated, we use the parasmaipada terminations.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.